The spin-polaron pairing and the x dependence of the T[sub c] in (La[sub 1[minus]x]Sr[sub x])[sub 2]CuO[sub 4]

Journal Article · Mon Aug 10 04:00:00 EDT 1992 · Modern Physics Letters B; (Singapore)

DOI:https://doi.org/10.1142/S021798499200199X· OSTI ID:6977316

Mota, R ^[1]; Lima, G A.R. ^[2]; Fazzio, A ^[3]

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1. Dept. de Fisica, Univ. Federal de Santa Maria, 97119 Santa Maria (Brazil)
2. Dept. de Fisica e Quimica, da Univ. Estadual Paulista, Caixa Postal 205, 12500 Guaratingueta (Brazil)
3. Inst. de Fisica da Univ. de Sao Paulo, Caixa Postal 20516, 01498 Sao Paulo (Brazil)

In this paper, the authors present a study of superconducting correlations associated to the mechanism of spin-polaron pairing resulting from an attractive exchange interaction between spin-polarons. The spin-polarons associated with itinerant holes in CuO[sub 2] are assumed to be created by strong intra-atomic exchange interaction with quasi-localized spins. The interplay of Hund's coupling and superexchange between quasi-localized spins gives rise to an attractive interaction between spin-polarons which leads to the formation of spin-singlet spin-polaron-pairs. The two-particle Green function in the ladder approximation for the itinerant holes with this attractive interaction is used to calculate in (La[sub 1[minus]x]Sr[sub x])[sub 2]CuO[sub 4] the dependence on the hole concentration of the critical temperature T[sub c]. The obtained results reproduce the experimental observations satisfactorily.

• OSTI ID: 6977316
• Journal Information: Modern Physics Letters B; (Singapore), Journal Name: Modern Physics Letters B; (Singapore) Vol. 6:18; ISSN 0217-9849; ISSN MPLBET
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
COPPER COMPOUNDS
CORRELATION FUNCTIONS
CUPRATES
EXCHANGE INTERACTIONS
FUNCTIONS
GREEN FUNCTION
HIGH-TC SUPERCONDUCTORS
HOLES
INTERACTIONS
LADDER APPROXIMATION
LANTHANUM COMPOUNDS
MANY-BODY PROBLEM
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POLARONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPIN
STOICHIOMETRY
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TWO-BODY PROBLEM